On Fri, 07 Nov 2008 18:16:26 -0800, septicman@peoplepc.com wrote:

> My 93 EX automatic has over 200K miles on it, I am recent nth. owner,
> car runs perfectly but only gets low 30's with careful suburban driving.
>
> Based on experience, what one item would you suggest replacing that can
> have an immediate positive impact on fuel economy?
>
> Thanks in advance !

apart from all the usual maintenance items, look at the tw sensor. even
though testing showed mine to be "in limits", replacement took my civic
from 31.8mpg up to 36.2mpg.

i only really spotted the difference because i have two cars essentially
the same - civic and crx, both automatic, same engine, maintained to the
same standards, even same tires/tire pressures. crx was in the 36's long
term average, civic as stated. oil always got dirtier quicker on the
civic too and it had a problem warming up in cold weather, even with two
new thermostats. finally concluded it had to be the sensor, and hit pay
dirt. was totally convinced when i went to my local junkyard and
discovered that there was hardly a honda in the place that still had a tw
sensor in it. someone, somewhere was switched on to this problem some
time ago!